Selected ATcT [1, 2] enthalpy of formation based on version 1.172 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.156 to include species relevant to a study of photodissociation of formamide[4].

Nitrosyl hydride

Formula: HNO (g)

CAS RN: 14332-28-6

ATcT ID: 14332-28-6*0

SMILES: N=O

InChI: InChI=1S/HNO/c1-2/h1H

InChIKey: ODUCDPQEXGNKDN-UHFFFAOYSA-N

Hills Formula: H1N1O1

2D Image:

Aliases: Nitrosyl hydride; Hydrogen nitride oxide; Hydrogen nitrogen oxide; Hydrogen nitroxide; Nitrosyl N-hydride; Nitrosyl of Angeli; Nitroxyl; Nitoso hydrogen; HNO; HN=O; H-N=O; ONH

Relative Molecular Mass: 31.01408 ± 0.00032

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
109.94	106.97	± 0.11	kJ/mol

3D Image of HNO (g)

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Top contributors to the provenance of Δ_fH° of HNO (g)

The 20 contributors listed below account only for 88.3% of the provenance of Δ_fH° of HNO (g).
A total of 23 contributors would be needed to account for 90% of the provenance.

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
38.8	1959.4	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16450 ± 10 cm-1	Dixon 1981, Dixon 1984, Dixon 1996
9.7	1959.6	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16450 ± 20 cm-1	Petersen 1985, Dateo 1994
6.0	1959.5	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16470 ± 20 (×1.269) cm-1	Dixon 1984, Dixon 1996, Dateo 1994
5.5	1483.2	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Dingle 1975
5.5	1483.1	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Callear 1970
4.1	1483.4	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52408 ± 10 (×1.164) cm-1	Kley 1973, Miescher 1974, est unc
3.3	1952.4	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.10 ± 0.56 kJ/mol	Harding 2008
2.1	1952.2	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.32 ± 0.70 kJ/mol	Harding 2008
1.8	1952.1	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 822.97 ± 0.75 kJ/mol	Tajti 2004, est unc
1.7	1952.3	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 822.76 ± 0.74 (×1.044) kJ/mol	Harding 2008
1.4	1952.5	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.25 ± 0.84 kJ/mol	Harding 2008
1.4	1952.7	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.04 ± 0.84 kJ/mol	Harding 2008
0.9	1483.3	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52420 ± 12 (×2) cm-1	Miescher 1974, Huber 1979
0.9	1951.9	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 196.74 ± 0.25 kcal/mol	Karton 2007
0.8	1436.3	N2 (g) → N+ (g) + N (g)	Δ_rH°(0 K) = 24.2880 ± 0.0009 eV	Tang 2005
0.8	1952.6	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 822.69 ± 1.14 kJ/mol	Harding 2008
0.7	1966.1	1/2 H2 (g) + 1/2 N2 (g) + 1/2 O2 (g) → HNO (g)	Δ_rH°(0 K) = 110.9 ± 1.2 kJ/mol	Szakacs 2011
0.6	1436.2	N2 (g) → N+ (g) + N (g)	Δ_rH°(0 K) = 24.2883 ± 0.0010 eV	Tang 2005
0.6	1436.1	N2 (g) → N+ (g) + N (g)	Δ_rH°(0 K) = 24.2888 ± 0.0010 eV	Tang 2005
0.6	1951.7	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 196.78 ± 0.30 kcal/mol	Karton 2006, Karton 2011

Top 10 species with enthalpies of formation correlated to the Δ_fH° of HNO (g)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
50.6	Nitric oxide	NO (g)	90.627	91.131	± 0.064	kJ/mol	30.00614 ± 0.00031	10102-43-9*0
50.6	Nitrogen dioxide	ONO (g)	36.866	34.059	± 0.064	kJ/mol	46.00554 ± 0.00060	10102-44-0*0
50.5	Nitrosyl ion	[NO]+ (g)	984.494	984.489	± 0.064	kJ/mol	30.00559 ± 0.00031	14452-93-8*0
49.2	Dinitrogen tetraoxide	O2NNO2 (g)	20.17	10.88	± 0.14	kJ/mol	92.0111 ± 0.0012	10544-72-6*0
48.9	Nitrosyl chloride	ClNO (g)	54.461	52.559	± 0.067	kJ/mol	65.45884 ± 0.00095	2696-92-6*0
47.7	Dioxohydrazine	ONNO (g)	172.91	171.14	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*0
47.7	Dioxohydrazine	ONNO (g, cis)	172.91	171.14	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*2
45.4	Nitrogen sesquioxide	ONN(O)O (g)	90.74	86.17	± 0.15	kJ/mol	76.01168 ± 0.00091	10544-73-7*0
41.8	Nitrous acid	HONO (g)	-72.987	-78.644	± 0.077	kJ/mol	47.01348 ± 0.00061	7782-77-6*0
41.8	Nitrous acid	HONO (g, trans)	-72.987	-79.131	± 0.077	kJ/mol	47.01348 ± 0.00061	7782-77-6*1

Most Influential reactions involving HNO (g)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
0.598	1959.4	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16450 ± 10 cm-1	Dixon 1981, Dixon 1984, Dixon 1996
0.464	1955.1	[HNO]- (g) → HNO (g)	Δ_rH°(0 K) = 0.338 ± 0.015 eV	Ellis 1983
0.460	1954.2	HNO (g) → [HNO]+ (g)	Δ_rH°(0 K) = 10.18 ± 0.01 eV	Baker 1990
0.374	1973.9	HNO (g) → NOH (g)	Δ_rH°(0 K) = 25.82 ± 0.30 kcal/mol	Dixon 2006
0.319	1954.1	HNO (g) → [HNO]+ (g)	Δ_rH°(0 K) = 10.184 ± 0.012 eV	Kuo 1997
0.262	1973.10	HNO (g) → NOH (g)	Δ_rH°(0 K) = 107.77 ± 1.5 kJ/mol	Klippenstein 2017
0.216	1955.9	[HNO]- (g) → HNO (g)	Δ_rH°(0 K) = 0.317 ± 0.022 eV	Dixon 2006
0.149	1959.6	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16450 ± 20 cm-1	Petersen 1985, Dateo 1994
0.092	1959.5	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16470 ± 20 (×1.269) cm-1	Dixon 1984, Dixon 1996, Dateo 1994
0.041	1955.10	[HNO]- (g) → HNO (g)	Δ_rH°(0 K) = 0.333 ± 0.050 eV	Ruscic W1RO
0.040	1944.1	HNOH (g, trans) → HNO (g) + H (g)	Δ_rH°(0 K) = 53.9 ± 1.0 kcal/mol	Klippenstein 2009, est unc
0.035	1952.4	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.10 ± 0.56 kJ/mol	Harding 2008
0.028	1954.10	HNO (g) → [HNO]+ (g)	Δ_rH°(0 K) = 10.192 ± 0.040 eV	Ruscic W1RO
0.028	1955.5	[HNO]- (g) → HNO (g)	Δ_rH°(0 K) = 0.312 ± 0.061 eV	Ruscic G4
0.023	1973.8	HNO (g) → NOH (g)	Δ_rH°(0 K) = 25.58 ± 1.2 kcal/mol	Ruscic W1RO
0.022	1952.2	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.32 ± 0.70 kJ/mol	Harding 2008
0.020	1973.4	HNO (g) → NOH (g)	Δ_rH°(0 K) = 26.06 ± 1.3 kcal/mol	Ruscic G4
0.020	1973.7	HNO (g) → NOH (g)	Δ_rH°(0 K) = 25.14 ± 1.3 kcal/mol	Ruscic CBS-n
0.019	1952.1	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 822.97 ± 0.75 kJ/mol	Tajti 2004, est unc
0.018	1952.3	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 822.76 ± 0.74 (×1.044) kJ/mol	Harding 2008

References

1		B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2		B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, Active Thermochemical Tables: Thermochemistry for the 21^st Century. J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3		B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.172 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		K. L. Caster, N. A. Seifert, B. Ruscic, A. W. Jasper, and K. Prozument, Dynamics of HCN, NHC, and HNCO Formation in the 193 nm Photodissociation of Formamide J. Phys. Chem. A (in press) (2024) [DOI: 10.1021/acs.jpca.4c02232]
5		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.

Acknowledgement

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.